Anti-locking control system

In an anti-locking control system for independently regulating the brake pressure to the brakes of two wheels on one axle, which system includes wheel movement sensors for determining the movement behavior of each of these wheels and for generating corresponding signals, an evaluation circuit connected to process these signals and to generate control signals, two brake pressure control devices each arranged to receive these control signals for the individual regulation of the brake pressure at a respective one of the two wheel brakes, and a monitoring device which independently monitors the response periods of the brake pressure control devices and interrupts their regulation when a predetermined response period is exceeded by the one of the brake pressure control device, to thereafter cause both brake pressure control devices to be influenced identically, the improvement wherein said monitoring device comprises first switching means connected to respond when the response time of one brake pressure control device exceeds the predetermined period for supplying the control signals destined for the other brake pressure control device to the corresponding inputs of the first brake pressure control device, and second switching means including:

• a timer connected to be actuated, to produce an output signal having a preselected duration, when both brake pressure control devices have responded for longer than the predetermined response period;
• and means connected to the output of said timer for causing the control signals generated by the evaluation circuit to be applied to their respective control devices for the preselected duration of the output signal from said timer and for blocking the delivery of control signals to the brake pressure control device after termination of the output signal from said timer.